Hoisting mechanism



(No Model.)

B.L.TOQUET. HOISTING MEGHANISM. No. 542,545. Patented July 9, 1895.

FUEL FIE- E- am w Nita STATES ATENT Orrrcn.

HOISTING MECHANISM.

. SPECIFICATIDN forming part of Letters Patent No. 542,545, dated July 9, 1895.

Application filed January 25, 1895- To all whom it may concern.-

Be it known that I, BENJAMIN LOUIS To- QUET, a citizen of the United States, and a resident of Westport,Fairfield county, Connecticut, have invented an Improved Hoisting Mechanism, of which the following is a specification. Y

My invention consists of improvements in the construction of hoisting mechanism, and more particularly of that class called portable hoists or pulley-blocks, and the main object of myinvention is to provide a hoisting mechanism which can be economically manufactured, will be efficient in operation, d'urable in construction, and will automatically sustain the load at any height to which it may be lifted and allow of a lowering of theload with ease.

In the accompanying drawings, Figure 1 is a vertical sectional view on the line 1 1, Fig. 2, of my invention as embodied in a portable hoist or pulley-block. Fig. 2 is a front elevation of the same. Fig. 3 is a plan view. Fig. 4: is a View of the frame with all movable parts detached, and Fig. 5 isa sectional view of a modification. I

In the construction shown A is the frame of the hoist or pulleyblock, provided with the usual suspending hook K, and C is the hoisting wheel or sheave, shown sprocketed in this instance for the hoisting-chain N, which carries the lower hook L for the load. This hoisting-wheel is mounted to turn freely upon a horizontal shaft S, which may be termed the main shaft, although it does not turn with the chain-wheel. By preference the drivingpnlley D is mounted outside the frame A upon the same shaft S, but the said pulley can turn independently of the shaft. The power may be transmitted to the hoisting sheave or wheel C from the driving-pulley by any suitable means, but I prefer to employ the gearing shown. Adjacent to the inner side of the driving-pulley D is a pinion E, which is secured to or formed in one with the'said pulley, and this pinion meshes into gears F F, whose shafts f pass through bearings in the frame A and have at their opposite ends pinions F F meshing with an internal gear B, which may be formed in one with or secured to the hoisting wheel or sheave C.

it can turn independently of the shaft S, and

The bearings in the frame for the shafts S Serial No. 536,169. (No model.)

before referred to are provided with frictionbushings R R of hard fiber, lignum-vitm, or other suitable material. I

A guide G attached to or formed in one with the frame A may be provided for the power chain or rope Mpassing over the pulley D. p

In the construction shown in Figs. 1, 2, and 3 the pinion E and gears F F, as well as the driving-wheel D, are shown as arranged outside the frame A on one side, while the pinions F F and internal gear B are shown in side the frame A, near the opposite side; but I do not wish to confine myself tothis arrangement. For instance, as shown in the modi fication, Fig. 5, the gear B and pinions F F may be outside the frame A, and in such event there will be but one friction-bushing R for the shaft S. The essential features of construction and operation are the same in this modification as in the embodimentof my invention described with reference to Figs. 1, 2, and 3.

The operation I will now describe. As I have already explained, the driving-pulleyD this it always does in hoisting; but I provide means for automatically locking the pulley to the shaft at other times for sustaining the load and lowering. For this purpose I may secure to the end of the shaft S by a setscrew T, or otherwise, a ratchet-wheel Q, with which engages a spring-pawl P on the hoisting-wheel, so that when the pulley D is turned by its chain or rope in the direction of the arrow, Fig. 2, for hoisting the pulley will turn freely upon the shaft and communicate a hoisting movement to the wheel or sheave C throughgearin g such as heretofore described; but when hoisting is no longer applied to the pulley' D the latter will belocked to the shaft by the pawl and ratchet and motion of the pulley D in the reverse direction will cause the shaft S to move with it in its bearings in the frame, and this movement of the shaft S will be independent of, and at a different speed from, the movement of the hoisting wheel or sheave C, and in the particular construction shown it will be in a direction opposed to that which would be communicated through the gearing described to the said hoisting wheel or sheave Cfrom the reversed movement of the pulley D. The friction, between the shaft 8 and the wheel 0 whichis thus sustained by the shaft and turns upon it will be proportioned to the load, and the latter can thus be made self-sustaining. The hearing or bearings supporting the shaft S can also be used by the describedlocking of the shaft to the driving-pulley in other conditions than hoisting to make the. load self-- sustaining and capable of being lowered easily. I prefer, as shown, to make use of the combined frictional effect betweenthe shaft S and hoisting-wheel and between the shaft and its bearing or bearings, to furnish what may be termed the automatic loweringbrake.

I; claim as my invention 1. A hoisting mechanismv havingxafname, a; shaft adaptedto turn in bearings illithfl frame, a hoisting wheel mount-ed tolurn, upon said; shaft, and'a driving pulley free-toiturn inde pendently of said shaft in hoisting, and means for causing the shaft to turn;withthe-drivi-ng pulley for lowering, andat a; different speed from the hoisting wheel.

2., A, hoisting-mechanismhavinga frame, a; hoisting-wheel,a-shaftiLnbeaningsintheframe and, u-ponwhich saidwheelis mounted toiturn; independently of said shaft: when. hoisting,- and means for t-urningthesaid shaft in adirection oppositetotthat of thehoistingwhcel for-lowering, substantially as described.

3. A hoisting; mechanismlia-vinga hoisting wheel, a shaft, supporting said wheel, a frameha-ving-one-or more frictionbearingsfor saidv shaft, a, driving pulley free-toturnindependr ently of the shaft in hoisting, and-.meansfor: causing the shaft to turn with the driving;-

pulley for, lowering/ at a. diifenent,speed from the hoistingwheel.

4-. hoisting mechanism, comprising a;

shaft, a hoisting wheel mounted to. turn on said shaft, a driving pulley geared at all times to said hoisting wheel, the said driving pulley being free to turn independently of said shaft in hoisting and means for causing the shaft to turn with the pulley for lowering at a different speed from thehoisting wheel.

5. A hoisting mechanism comprising a main shaft, a, hoisting: wheel mounted to turn on said shaft, a driving pulley having affixed to or-formed in one with it a pinion adjacent to .it,,gearing connecting said pinion with the "hoisting wheel, the driving pulley being free Ftotur-n independ'entlyof the main shaft in -'-hoisting and means for causing the shaft to turn with the drivingpulley for'loweringr 6. A- hoisting mechanism comprising a shaft, a hoisting wheel mounted toturn upon said: shaft,,a,dniv.ing pulley, gearing to transmit motion; to. the hoisting wheel, the saidpulley being mounted: to turn uponi theshaft in hoisting with means for automaticallylock:

ing thesaid shaft t0-thedrivi-ngpulley when nothoisting,

7'. A hoisting mechanism, comprising a- .frame, a-shaft mounted to turn in the-frame,

one on more-friction, bearings for the shaft, a hoisting wheel; free toturnuponthe shaft, a driving pulley also free to turn/upon, the

shaft inhoisting, means for-locking it to the i shaftat other times. and connecting gearing consisting of a pinion on;th'e,pull'ey,.gearsaF F, pinions F F and a gear on the hoisting wheel, all substantially as described.

In. testimony, whereof, I havev signed my name tot-his specification in. the; presence of twosubscnibing; witnesses.

I BENJAMIN LOUIS TQQUET.

Witnesses:

EDI HJ. GRIsWoLn, HUBERT HOWSON. 

